Arthur lichfield sowerby



A. L. SOWERBY. FOUNTAIN PEN.

APPLICATION FILED JUNE 5,19l8.

1 ,306, 394. Patented J uiie 10, 1919.

I I INVENTOR. AL. Sowsasv g the plate upon the sac and deflate the latter,

as mar ice.

ARTHUR LICHFIELD SOWERBY, OF BACONSTHOBPE, HOLT, ENGLAND.

FOUNTAIN PEN.

Application filed June 5, 1918. Serial No. 238,368.

'To all whom it may concern:

This invention relates to improved means for filling fountain pens and refers to that type of pen in which a collapsible sac is provided and hasarranged alongside it a plate for the purpose of compressing the sac so that when the pen is dipped into a supply of ink and the pressure of the plate is removed, (by the rotatingof a knob at the end of the barrel,) the elasticity of the sac when regaining its normal, 2'. 6., expanded, shape will draw a supply of ink into the pen and thus fill it.

My invention consists of an improved method of pressing the plate upon the sac and withdrawing it" therefrom by which a satisfactory charge of ink is obtained. In

addition to this the device I have constructed pearance, and not likely to get out of. order and the construction is such that the operating mechanism is to all intents and purposes locked when not required.

My invention may be broadly described as consisting in providing adjacent to the pres'- sure plate a spring, say a leaf spring, one end of which is anchored toward the nib of the pen and the other is movable lengthwise in the barrel of the pen by a rotatable screw device attached to the opposite end of the pen and so constructed and arranged that by a turning movement, in one direction, a nut which cooperates with the movable end of the spring is caused to travel a short dis;

tance down the inside of the barrel and thus" bend or bow the spring causing it to push while the reverse rotation removes the spring or allows it to return to its normal straight or flat position inside the pen, thus liftingthe plate from the sac or allowing it to be pressed back by the sac when it expands.

The screwin device may be of any suitable kind but I'preferably fit a screw plug Specification of Letters Patent.

Patented June it). 191%).

into the end of the pen and provide the plug with a screw carrying a non-rotatable. nut said screw having an unthreaded extension which is passed through the plug and attached to a head outside same by which it can be turned, the said screw having also an annular rib between the threaded portionand unthreaded part adapted to bear against the inside of the plug to prevent the screw being withdrawn therethrough.

tance along "the inside of the pen in one direction of screw rotation with corresponding travel of the nut, the latter presses upon the end of the spring and bows it, while turning the screw in the other direction reverses the travel of the nut and either draws back the spring or allows it to assume its normal straight position. The spring may be attached to the pressure plate by a lug or clip stamped therefrom engaging one or two holes in the spring.

I will now describe my invention with reference to the accompanying drawings, in

which, one method of carrying the invention the barrel I have fitted a screw plug 62, having centrally arranged in it a screw 6 carrying a nut or cross piece f, said screw having an extension 9 attached to a fingerpiece or knob 71. by which the screw can be turned from outside the pen. A shoulder (or rib i is provided and fits within a recess in the plug (Z and prevents the removal of the screw 0 through the plug. In this example along the inside of the pen a leaf or As the screw is turned the nut moves a short dislike spring j is fitted and has one end P anchored at 70 over a ring 70 fitted in an annular groove in the pen. Toward its-other end the spring is supported by a like ring Z and has its extremity positioned in a recess m in the nut 7. Other means of anchoring this end of the spring may be employed.

It will be seen from Fig. 1 that the nut is easy rotations of the part it in one direction will compress the sac wlnle reverse rotatlon will allow it to expand and thus it is a very easy matter to fill the pen.

stamping a lug or clip 0 from the plate c and passing the said lug through two holes Fi 3 shows on enlar ed scale how bv j in the spring j, a simple and effective connection between the spring and the plate are obtained without any riveting, soldering or other binding means.

In Fig. 4: which is a cross section about the line 4-4 of Fig. 2, I have shown the nut f of cross bar formation and have-illustrated how by fitting the same into the before-mentioned groove a, and in another short groove a at the rear end of the barrel, a slmple method preventing rotation of thenut in its backward and forward movements is obtamed.

1. In a fountainpen, a hollow barrel, a

compressible sac therein, a spring for compressing the sac, a slidable nut engaging one end of said spring, a screw engaging the nut for traversing the same forwardly and also backwardly, and means attached to the screw for moving the latter as desired.-

2. In a fountain pen, a hollow barrel, a compressible sac therein, a spring for compressing the sac, a nut slidably and nonrotatably mounted within the barrel and engaging one end of said spring, a screw engaging the nut for traversing the same forwardly and'also backwardly, and a rotatable .finger piece, outside of the barrel and attached to the screw, for moving the latter as desired. I

In witness whereof I have hereunto set my hand in presence of two witnesses.

ARTHUR LIGHFIELD SOWERBY.

' lVitnesses ELIZABETH PARRr, HENRY FAIRBROTHER. 

